Pixel Circuit Amplifying Unit for OLED Power Reduction
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in reducing power consumption for charging and discharging data lines, particularly due to the need for high swing ranges in data signals to drive organic light emitting diodes effectively.
Innovation Solution
A pixel circuit design that includes an organic light emitting diode, a switching transistor, a storage capacitor, an amplifying unit, and a driving transistor, where the amplifying unit amplifies the data signal from a small swing range of about 5 V to a larger swing range of about 25 V, allowing the driving transistor to efficiently drive the organic light emitting diode with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large swing range data signal is used to drive the organic light emitting diode, then the driving efficiency is improved, but the power consumption for charging and discharging the data line increases
Solution Approach 1:
The pixel circuit is divided into multiple functional blocks: switching transistor for signal input, storage capacitor for signal retention, amplifying unit for signal enhancement, and driving transistor for OLED control. This segmentation allows the data signal to maintain a small swing range while the amplifying unit generates the necessary large swing range signal to drive the OLED, thereby reducing power consumption on the data line while maintaining driving efficiency.
Solution Approach 2:
The amplifying unit acts as an intermediary between the data signal input and the OLED driving. It receives the small swing range data signal, amplifies it to the required large swing range, and then drives the OLED. This intermediary function allows the data line to operate with low power consumption while the OLED receives the necessary high-power drive signal.
2Use of energy by moving object
If a small swing range data signal is used, then the power consumption for charging and discharging the data line is reduced, but the ability to drive the organic light emitting diode effectively is worsened
Solution Approach 1:
The amplifying unit changes the voltage parameter of the data signal from a small swing range to a large swing range. This parameter transformation occurs within the pixel circuit, allowing the data line to transmit low-power signals while the OLED receives high-power drive signals with sufficient driving capability.
Solution Approach 2:
The storage capacitor stores the incoming data signal before it is amplified, ensuring that the signal is properly conditioned and ready for amplification. This preliminary storage action ensures that no signal information is lost during the transformation from small to large swing range, maintaining the reliability of the driving capability.
Data Source
AI summary
A pixel circuit and organic light emitting display device using the pixel circuit are disclosed. One aspect of the pixel circuit includes an organic light emitting diode, a switching transistor configured to transfer a data signal in response to a scan signal, a storage capacitor configured to store the data signal transferred through the switching transistor, an amplifying unit configured to amplify the data signal stored in the storage capacitor to generate an amplified signal having a swing range greater than a swing range of the data signal, and a driving transistor configured to drive the organic light emitting diode in response to the amplified signal.